Casting process for rocker arm shell of super-thick coal seam coal mining machine

Abstract

The invention relates to a casting process for a rocker arm shell of an extra-thick coal seam coal mining machine, which is characterized in that a plane passing through the axis of a motor cylinder and the axis of a planet head mounting cylinder of the rocker arm shell of the coal mining machine is used as a parting surface, a sand box molding casting mode combining a real sample mold and a core assembly is adopted, and a sand mold outer mold and a loam core are made of resin sand; a casting water channel part, a round corner part and a corner on a loam core are made of chromite sand, an open bottom return type pouring system and a horizontal pouring mode are adopted, the pouring system is completely made of ceramic pipes, an open riser is arranged at each of a planet head mounting cylinder and a motor cylinder, an open riser is arranged at the joint of the motor cylinder and an arm support, and an open riser is arranged at the joint of the motor cylinder and the arm support. Four blind risers are arranged on the upper plane of the arm support and on the edge close to the coal wall side at intervals, two blind risers are arranged on the upper plane of the arm support and on the edge close to the goaf side at intervals, and a plurality of external chillers are arranged at the bottom of the lower box. According to the invention, many casting defects can be avoided, the production period is shortened, and the casting quality and the production efficiency are improved.

Description

technical field [0001] The invention relates to a new casting process for a rocker shell of an extra-thick coal seam shearer. Background technique [0002] The rocker shell of the extra-thick coal seam shearer is a large box-type steel casting. According to the current casting process, casting defects such as shrinkage, looseness, cracks, pores, sand inclusion, and sticky sand are very likely to occur. The reasons for these defects Mainly include the complex structure of the shell, many hot joints, uneven compaction of molding sand, incomplete cleaning of floating sand in the cavity during core loading, and floating of the mud core of the motor cylinder, etc. The occurrence of these defects will directly lead to subsequent machining. In the process, it is necessary to carry out necessary digging and repairing treatment for the defective parts, which brings great difficulties to the subsequent machining and seriously affects the production organization of the product. Therefo...

AI Technical Summary

Problems solved by technology

[0002] The rocker arm shell of the extra-thick coal seam shearer is a large box-type steel casting. According to the current casting process, casting defects such as shrinkage cavities, looseness, cracks, pores, sand inclusions, and sand sticking are prone to occur. The reasons for these defects are It mainly includes the complex structure of the shell, many hot joints, uneven compactness of the molding sand, incomplete cleaning of the floating sand in the cavity when the core is lowered, and the floating of the motor barrel mud core, etc. The occurrence of these defects will directly lead to the subsequent machining In the process, it is necessary to carry out necessary digging and repairing of the defective parts, which brings great difficulties to the subsequent machining and seriously affects the production organization of the product. For this reason, a lot of manpower, material resources and financial resources are required.

On the other hand, many transmission systems need to be installed inside the rocker shell of the shearer during use, and the existence of casting defects often causes the mechanical properties of the transmission shell to fail to meet the requirements for use, and causes shell deformation, Accidents that affect production such as wear and deformation of the hole system, and even leakage of the rocker arm shell during use

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